Centering device



W. n. BARTLETT AND s. MARQUIS.

CENTERIIIG DEVICE.v APPLICATION FILED OCT. l, 19.19.

W. D.,BAAIIEII AND s. MARQUIS.

CENTERING DEVICE.

APPLICATION FILED locT. II, I9I9.

Patented Jan. 3, 1922.

5 SHEETS-SHEET 2.

N MARI W. D. BARILEIT AND S. MARQUIS.

' CENTERING DEVICE.

APPLICATION FILED OCT. Il, i919. c

Patented Jan. 3, H522.

5 SHEETS-SHEET 3.

W. D. BARTLETT AND S. MARQUIS.l

. CENTERING DEVICE.

APPLICATION FILED OCT. ll, 1919. 1,402,720.

Patented J an. 3,` 1922.

5 SHEETS-SHEET 4- grigi@ W. D. BARTLETT AND S. MARQUIS.

CENTERING DEVICE. AFFLlcATIoN FILED ocr.1.1l 1919.

m6111611 Jan. 3,1922.

i entre WILLIAM: n. nenrrn'rrenn sYnnnYMAaeUrs, or c :rinviniiinn,v entre, y.essrefnonsor ons-FOURTH To anamnese. rnoivrrson ann ons-reunen ro J. ALBERT Kernen' 0F CLEVELAND, OHIO.

' incenso.

cnnrnni'ns nievrcn.

ap'plnmienV aie'a 'october 11, 1319. i serial no. 330,117.`

To @ZZ whom t may concerne:

Be it known that we, VI'LLIAMD.' BART- LnT'r and SYDNEY MAnQUIs, citizens of' the United States, residents ot Cleveland, county of Cuyahoga, and State otOhio, have invented new and useful improvements in Centering Devices, of which the following is a specification, the principle ot the invention being herein explained and the liest mode in which vwe have contemplated applying that principle, so as to distinguish it from other inventions.

Our invention relates to centering devices and particularly to devices ot this nature utilized for securely clamping hlanlrs, in which centers are to he ormechin a chuck and then teeding'a rotating drill to and from said blanlrs,thus performing the centering operation,it hein'g designed that the blank shall later he turned or ground upon said centers. Particularly, relates to centering devices utilized `for drilling centers in the heads and the stems of valves. f i

The annexed drawings and theffollowing description set forth ini detail certain means embodying our invention, `the disclosed means, however,` constituting but one of the various mechanical tormsin which the principle ot the inventionmay be applied.

In said annexed drawings:

Figure 1 represents a longitudinal ver-V tical section of our improved @centering device, taken in the plane `indicated by the line I-L/Figure 3,..and showingthe drill removed from the work; f

Figure 1n represents a fragmentary longitudinal vertical section, taken in a plane different from that in` which Figure 1 is taken, and particularly showing a certain section ot a cam shaft, hereinafter fully described, and certain related elements;

Figure 2 represents a side elevation, with parts in section, showingthe several elements in drilling positiony.

Figure represent-s a right hand end ele` 23 vationot the device, with parts in section; Figure Il represents a vertical transverse section, taken in the planes indicated by the line Ill-lV, Figure 2; f l

Figures 5 and 6 represent transverse vertical sections, taken in the planes indicated by the lines V-V and VI-VI, re-

spectively, Figure 1.,

our invention .Figure 'l' represents a fragmentary ver- A tical longitudinal section, taken in the plane indicated by the line I-L Figure 3, showing the chuck thrown back from working position and the work removed;

Figures 8 and 9 represent, respectively, perspective views or an outer sleeve `member and an inner sleeve ,memheig utilized in our centering device; Y

`Figures 10 and 11 represent, respectively, perspective and end views ot a cam shaft forming part ot' our invention.

Figures 12 and 13 represent, respectively, side and end views of a collet utilized in our invention. f i p Referring to the annexed drawings, there is indicated by the ordinallfV the tail-stock of our improved centering device mounted in a general frame work 1, the head-stock heing indicated by the ordinal 9. It is designed that hy suitable (means hereinafter` fully described a -sleeve 2 connected to a spindle 3 hy means of key 15, to which Vspindle 3 is secured a drill 4, shall loe'rotated, and that i the whole tail-stock 14 including said elements 2, 8, 4f, and other related kelements hereinafter shall'be ted forward to effect the centering operati-on in thework which is here illustratedi'hy a .valvehaving the stem 5, the

head (3 and the stemfend?. ByY means hereinafter fully described Lthe work 5, during the drilling operation, is securely clamped in a chuck 8 mounted 'in the head- Y stoel: 9.. rlhe means for effecting the feeding operation include a feeding lever 10 and the means for effect-lng the work-clamping op- Verationinclude a clamping lever 11. A pulorder toprevent the sleeve 2 fromV rotating when adjustingthe spindle 3, we provideA a pin' 18, Figures 5 and 6, so-spring-actuated as normally to be held in inoperative posi tion, which pin is adapted to be forced against the action of` the spring into a hole 19 formed in a sleeve 2O connected to the vPatented Jan. 3, 1922.

mentioned sleeve 2 in a manner hereinafter fully de? in the sleeve 20 during the relative longitudinal movements 0f the sleeves 2 and 20.

The main rotating lelements in the tailstock include thoseheretofore described.

Four sets of ball races are provided, as

plainly shown in Figure 1, and the moving' races are indicated by the ordinal 22. The stationary races are indicated by the ordinal 24, of which two are secured inthe main frame 1 to the rear of the tail-stock 14 and hence are notlongitudinally movable and two 'are' secured in the longitudinally movable tail-stock 14. The balls for the races are .indicated by the ordinal 23 andthe lock nuts in each case by the ordinal 25. Screws 27 are utilized for securing the lock nuts after the races have been positioned. lt is evident that there are relatively moving opposed surfaces in the respective lock nuts 25 and the respective moving races 22 so that slight Vclearance or recess 26 is provided between the same, as plainly shown in Figure'` 1. l The forward moving race 22 is positioned at itsl rear against the face of nut 22B-screwthreaded to the sleeve 2, the cooperating stationary race 24 abutting against a shoulder of the tail-stock 14. The rear two sets` of races abut, respectively, against shoul-' ders formed in the rotatable sleeve 20 and the main frame 1, and the two rear parts of the rear pair of the forward sets of races abut,v respectively, against shoulders formed in the rotatablesleeve 2 and the non-rotatable tail-stock 14. Allof these details are plainly apparent in Figure 1, asVV also means for lubricating the various elements.

Formed in the bottom surface of the tailstock 14 is a rack segment 29 adapted to mesh with a pinion 30 mounted upon a square shaft 31, to an outer extending end of which shaft is secured the feeding lever 10. The other end of said shaft 31 comprises a round section 36 which is rotatably mounted in the main frame 1,V Figure 5. Mount-ed in a recess 37 formed in the pinion 30 and secured at one end to said pinion and at the other end to said main frame 1 is a torsion spring 32. It is evident from the foregoing description and the accompanying drawings that the actuation of the feeding lever 10 the work 6 to complete the centering operation, the release of the feeding lever 10 resulting, through the tension to which the spring 32 is subjected, in the return of the tail-stock to the position shown in Figure 1.

During the ydrilling operation, the work is securely clamped in a collet 41 mounted in the chuck 8 and formed with a plurality of gripping surfaces. The means for effecting the clamping and unclamping of the work, as well as means for throwing the chuck 8 out of working position, I' if desired, will now be described in detail.

lThe clamping lever y11 is secured to square-VV en'd portions 42 and 42 of two shafts rotatably mounted by means of round portions 43 and 43 in the chuck 8, suitable bearing surfaces 45 and 45 being provided, as plainly shown in Figure 4, the clamping lever 11 serving to actuate both sets of shafts by means of the strap 11 connecting the lever 11 proper and the square end portion 42, Figure 4. The inner ends of the shafts 42 and 42 are formed with cam surfaces 44 and 44, the sections formed with these surfaces being elliptical in cross-section. These cam ends of` the shafts intersect inner and outer sleeves 50 and 51, respectively, mounted in the chuck 8, said sleevesbeing formed with opposed slots 50 andv 51, respectively, adapted to receive said cam shafts 44 and 44, said slots 50 and 51 registering'V in varying degrees for certain purposes hereinafter fully described. When the collet 41 is unlocked, the position of the camshafts 44 and 44 is varied 90O from the position shown in Figures 1a and 10, i. e., the major axis of the ellipse lies in a vertical plane. ln this position sleeves 50'and 51 register toan eX- tent substantially equal to the minor axis of the ellipse. It will be evident from F igures 8 and 9 that the end walls of the slots 50 and 51 are, respectively, curved surfaces, 502 and 512 and plainsurfaces 503 and 513 and thatv said surfaces, respectively, are reversed in the slots 50V and 51. The reason for this structure will be hereinafter described in detail. j

The collet 41 is a double cone collet provided with beveled surfaces 46 and 48, respectively, the surface 46 being formed at one end and cooperating with a collet nut 47 screw-threaded to the outer sleeve 51, and the inclined surface 48 being formedat the other end and ,cooperating with a collet nut 49 screw-threaded to the inner sleeve 50. It is evident that the movement of the cam shafts 44 and 44l from a position in which 1 the major axes of the ellipses lie in a vertical fecting the pivotal movementsof the chuck incenso chuck mounted therein is pivotally sup- I.

ported so as to be capable ofl being thrown backrout of Working position, when the `Work is of such a nature that it cannot be inn serted in and removed from the lchuck in the normal Working position of the latter. This is true, 4for instance, when centering the head 6 of valves 5. This pivotal movement of the chuck 8 out of position is also effected by the clamping lever 11. `The pivotal movement ytakesy kplace upon a pair of' pivot pins 53 mounted in brackets 54 formed in the main 'memberl, as plainly shown in Figure 3, there being provided suitable bushings 58. The position in which the chuck is thrown back is illustrated in Figure 7 heels formed on the chuck being adapted4 to strike stops 57 to limit Vthe movement When the chuck is thrown back into position,the movement is limited by astop surface 55. i

When Work such as the stem end 7 is being,t

centered, the same can be inserted in and removed from the chuck 8 Withoutthroiving the latter back, and, in order that the chuck may bepositively held from being thrown back during the collet nn'clamping action of the lever 1l, pins 58 are provided Which intersect brackets 54 and are adapted to be threaded inwardly of said brackets so as to intercept heels 56 of the chuck 8 and thus positively i'etain the latter in its Working position.

What We claim is:

l. In a head-stock, the combination of a body member; a. chuck pivotally mounted therein; means for effecting the pivotal movement of said chuck; and a collet supported in said chuck, the means effecting the pivotal. movements of said chuck'also being adapted to effect the tightening and loosening of said collet.

2. In a headstock, the combination of a body mem`ber;`-a chuck pivotally mounted therein; means for effecting the pivotal movement of said chuck; a movable sleeve supported in said chuck; a collet adapted t0 be tightened or loosened `by the movements of said sleeve; and a rotatableV shaft formed with a cam portion adapted to cause the movementsof said sleeve, the means for efalso being adapted to effect the rotation of said shaft.

3. In a head-stock, the 'combination of a body member; a chuck pivotally mounted therein; means for effecting the pivotal movement of said chuck; relativelymovable inner and outer sleeves supported in said chuck; collet adapted to be tightened oi" loosened by the movements of said sleeves;

anda rotatable'shaft formed with a cam'y portion adapted lto cause the *movements of said sleeves, the means for effectingy the pivotal-movements of the chuck also being adapted to effect the rotation of said shaft.

4. ln a liead-s'tock,the Vcombination of a body member; a Ychuck pivota'lly mountedV therein; means for effecting the pivotalv movementofsaid chuck; a collet supported Y, in said chuck, the means effecting the lpivotal movements of said chuck also being adapted to effectthe tightening and loosening of said collet; and means for preventing, if desired, the pivotal' movement of said chuck when loosening said collet.

5. 'ln a'head-stoclntlie combination' of a vbody membeia chuck pivo'tally mounted therein; means for effecting the pivotal movement of said chuck; a movable sleeve supported in said chuck; 'a collet adapted to be tightened or loosened bythe movements of said sleeve; a rotatable shaft formed with a cam portion adapted to cause the movements of said sleeve, the means for effecting the pivotal movements of the chuck also be ing adapted to effectthefrotation of'said shaft; and mea-nsv for preventing, if desired; the pivotalinovement ofsaid chuck when loosening said collet.

6. In centeringdevices, the combination of a tail-stockand a head-stock; a main frame upon which said stocks are mounted,l said tail-stock beingv longitudinally reciprocable of said frame; means for effecting the movements of said tail stock; drilling means mounted insaid tail stock; a chuck pivotally mounted in said head stock; means for effecting the pivotal 'movements and the clamping movements of said chuck; and means adapted positively to ylimit the pivotal movements of said chuck.

ico

7. In centering devices, the combination of a tail-stock and a head-stock; a main frame upon which said stocks are mounted,`

said tail stock being longitudinally reciprocable of said frame; means for effecting the movements of said tail stock; drilling means mounted in saidtail stock; a chuck pivotally mounted insaid head stock; means for ef fecting the pivotal movements and the Vclamping movements of said chuck; means `for preventing the pivotal movements of iso tail stock being longitudinally reciprocable of said frame; means for effecting the movements Aof vsaid tail stock; drilling means mounted in said tail stockt pivot pins mount ed in said head stockand upon which said chuck is mounted; means for effecting the pivotal movements and the clamping movements of said chuck; and means adapted positively to limit the pivotal movements of ,said chuck.

9. ln centering means, the combination of a ltail stockand a head stock; a main frame upon which said 'stocks are mounted, said tail stock being longitudinally reciprocable 1 of' said frame; means for effecting the movements of said tail stock; drilling means mounted in said tail stock; pivot pins mounted in said head stock and upon which said chuckis mountedymeans for effecting the pivotal movements ,and the clamping movements of said chuck; means'for preventing the pivotal movements of said chuck during its clamping movements, if desired; and

Y Y mounted insaid chuck, said vsleeves beingv vmeans adapted positively to limit the pivotal fsaid chuck; a clamping lever secured to said shafts; a pair of outer and inner sleeves formed With laterally disposed slots adapted to be intersected by the cam portions of said shafts, said sleeves being relatively longitudinally movable; a split collet disposed Within said inner sleeve, the turning of said camsin the slots of said sleeves being adaptrelatively to movesaid head stock and sup-A ported elements and said drilling means.

11.v Infcentering devices, the combination of a main frame; a head stock mounted thereon; a pair of oppositely disposedV pivot pins mounted in said head stock; a chuck pivotally, mounted upon said pins; a pair` of shafts mounted in said ychuck and provide'd With inner cam portions extending inwardly of the chuck Wall; means for rotat disposed centrally of the chuck Wall; inner and outer sleeves disposed intermediate said chuckrvvall and said collet, said sleeves being relatively longitudinally movable and formed'with oppositely disposed slots adapt-` ed to be intersected by the inner cam portions of said shafts, said slots inthe open condition-of the collet being designed to register to receive said shaft cam portions in a certain position of the-latter, the rotation of said shaft cam portions effecting the relative longitudinal movement of said sleeves means actuated bysaid sleeve movements to close the collet, the actuationof the means operating the sleeves alsojeffecting the pivotal movements of the chuck; drilling means; and means adapted to move the lat-V ter toward andrf'rom saidhead stock.

Signed by us, this 15th day ofA Sept., 1919.

WILLIAM D. BARTLETT. SYDNEY MARQUIS.

lng said shafts ;7a collet split at both ends` 

